Orthodontic Assistant Practice Exam 2025 – Complete Prep Guide

TP springs, or Transpalatal springs, are orthodontic devices designed to apply force to the posterior teeth, primarily the molars. For effective results, these springs are placed from the lingual surface. This positioning enables the technician to exert the necessary force to maintain or achieve the desired positioning of the teeth effectively.

Placing TP springs from the lingual surface allows for a more controlled and discreet application of force, ensuring that the springs do not interfere with the patient's oral function and are less visible to others. Additionally, the lingual position helps in achieving the orthodontic goals without direct interference from the buccal or facial aspects of the dental arch, which could lead to complications in placement and force delivery.

The other placement options lack the effectiveness and comfort that comes from a lingual placement. For instance, positioning them on the labial or facial surfaces can obstruct normal oral function or aesthetics and may be less effective in exerting the required force across the dental arch. Hence, the optimal choice is placing TP springs from the lingual surface.